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$ openssl s_client -connect smtp.postmarkapp.com:2525 -starttls smtp

Connecting to 34.249.162.51

CONNECTED(00000006)

depth=2 C=US, O=DigiCert Inc, OU=www.digicert.com, CN=DigiCert Global Root G2

verify return:1

depth=1 C=US, O=DigiCert Inc, OU=www.digicert.com, CN=GeoTrust TLS RSA CA G1

verify return:1

depth=0 CN=.postmarkapp.com

verify error:num=10:certificate has expired

notAfter=Sep 15 23:59:59 2024 GMT

verify return:1

depth=0 CN=.postmarkapp.com

notAfter=Sep 15 23:59:59 2024 GMT

verify return:1

---

Certificate chain

0 s:CN=*.postmarkapp.com

   i:C=US, O=DigiCert Inc, OU=www.digicert.com, CN=GeoTrust TLS RSA CA G1

   a:PKEY: rsaEncryption, 2048 (bit); sigalg: RSA-SHA256

   v:NotBefore: Aug 16 00:00:00 2023 GMT; NotAfter: Sep 15 23:59:59 2024 GMT

 1 s:C=US, O=DigiCert Inc, OU=www.digicert.com, CN=GeoTrust TLS RSA CA G1

   i:C=US, O=DigiCert Inc, OU=www.digicert.com, CN=DigiCert Global Root G2

   a:PKEY: rsaEncryption, 2048 (bit); sigalg: RSA-SHA256

   v:NotBefore: Nov  2 12:23:37 2017 GMT; NotAfter: Nov  2 12:23:37 2027 GMT

Nothing on https://status.postmarkapp.com/